leapseconds revision 233445 
1243055Smarcel# <pre>
2243055Smarcel# @(#)leapseconds	8.13
3258286Sjmmv# This file is in the public domain, so clarified as of
4258286Sjmmv# 2009-05-17 by Arthur David Olson.
5258286Sjmmv
6258286Sjmmv# Allowance for leapseconds added to each timezone file.
7243055Smarcel
8258286Sjmmv# The International Earth Rotation Service periodically uses leap seconds
9243055Smarcel# to keep UTC to within 0.9 s of UT1
10272046Srodrigc# (which measures the true angular orientation of the earth in space); see
11258286Sjmmv# Terry J Quinn, The BIPM and the accurate measure of time,
12272046Srodrigc# Proc IEEE 79, 7 (July 1991), 894-905.
13243055Smarcel# There were no leap seconds before 1972, because the official mechanism
14258286Sjmmv# accounting for the discrepancy between atomic time and the earth's rotation
15243055Smarcel# did not exist until the early 1970s.
16258286Sjmmv
17243055Smarcel# The correction (+ or -) is made at the given time, so lines
18258286Sjmmv# will typically look like:
19258286Sjmmv#	Leap	YEAR	MON	DAY	23:59:60	+	R/S
20258286Sjmmv# or
21258286Sjmmv#	Leap	YEAR	MON	DAY	23:59:59	-	R/S
22243055Smarcel
23258286Sjmmv# If the leapsecond is Rolling (R) the given time is local time
24243055Smarcel# If the leapsecond is Stationary (S) the given time is UTC
25258286Sjmmv
26258286Sjmmv# Leap	YEAR	MONTH	DAY	HH:MM:SS	CORR	R/S
27258286SjmmvLeap	1972	Jun	30	23:59:60	+	S
28258286SjmmvLeap	1972	Dec	31	23:59:60	+	S
29258286SjmmvLeap	1973	Dec	31	23:59:60	+	S
30243055SmarcelLeap	1974	Dec	31	23:59:60	+	S
31258286SjmmvLeap	1975	Dec	31	23:59:60	+	S
32258286SjmmvLeap	1976	Dec	31	23:59:60	+	S
33258286SjmmvLeap	1977	Dec	31	23:59:60	+	S
34258286SjmmvLeap	1978	Dec	31	23:59:60	+	S
35258286SjmmvLeap	1979	Dec	31	23:59:60	+	S
36258286SjmmvLeap	1981	Jun	30	23:59:60	+	S
37258286SjmmvLeap	1982	Jun	30	23:59:60	+	S
38243055SmarcelLeap	1983	Jun	30	23:59:60	+	S
39258286SjmmvLeap	1985	Jun	30	23:59:60	+	S
40258286SjmmvLeap	1987	Dec	31	23:59:60	+	S
41258286SjmmvLeap	1989	Dec	31	23:59:60	+	S
42243055SmarcelLeap	1990	Dec	31	23:59:60	+	S
43258286SjmmvLeap	1992	Jun	30	23:59:60	+	S
44272056SngieLeap	1993	Jun	30	23:59:60	+	S
45243055SmarcelLeap	1994	Jun	30	23:59:60	+	S
46258286SjmmvLeap	1995	Dec	31	23:59:60	+	S
47258286SjmmvLeap	1997	Jun	30	23:59:60	+	S
48Leap	1998	Dec	31	23:59:60	+	S
49Leap	2005	Dec	31	23:59:60	+	S
50Leap	2008	Dec	31	23:59:60	+	S
51Leap	2012	Jun	30	23:59:60	+	S
52
53# INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
54#
55# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
56#
57#
58# SERVICE DE LA ROTATION TERRESTRE
59# OBSERVATOIRE DE PARIS
60# 61, Av. de l'Observatoire 75014 PARIS (France)
61# Tel.      : 33 (0) 1 40 51 22 26
62# FAX       : 33 (0) 1 40 51 22 91
63# e-mail    : (E-Mail Removed)
64# http://hpiers.obspm.fr/eop-pc
65#
66# Paris, 5 January 2012
67#
68#
69# Bulletin C 43
70#
71# To authorities responsible
72# for the measurement and
73# distribution of time
74#
75#
76# UTC TIME STEP
77# on the 1st of July 2012
78#
79#
80# A positive leap second will be introduced at the end of June 2012.
81# The sequence of dates of the UTC second markers will be:		
82# 		
83#                          2012 June 30,     23h 59m 59s
84#                          2012 June 30,     23h 59m 60s
85#                          2012 July  1,      0h  0m  0s
86#
87# The difference between UTC and the International Atomic Time TAI is:
88#
89# from 2009 January 1, 0h UTC, to 2012 July 1  0h UTC  : UTC-TAI = - 34s
90# from 2012 July 1,    0h UTC, until further notice    : UTC-TAI = - 35s
91#
92# Leap seconds can be introduced in UTC at the end of the months of December
93# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every
94# six months, either to announce a time step in UTC or to confirm that there
95# will be no time step at the next possible date.
96#
97#
98# Daniel GAMBIS
99# Head		
100# Earth Orientation Center of IERS
101# Observatoire de Paris, France
102